<template>
  <div class='home-category' @mouseleave="curCateId=null">
    <ul class="menu" v-if="$store.state.category.list.length > 0">
      <!-- 鼠标进入设置当前类别编号 -->
      <li
        @mouseenter="curCateId=cate.id"
        :class="{active:curCateId===cate.id}"
        v-for="(cate,idx) in cateList"
        :key="idx"
      >
        <RouterLink to="/">{{cate.name}}</RouterLink>
        <RouterLink to="/" v-for="sub in cate.children" :key="sub.id">
          {{sub.name}}
        </RouterLink>
      </li>
    </ul>
    <!-- 骨架屏 -->
    <template v-else>
      <ul class="menu">
         <li v-for="i in 10" :key="i">
            <XtxSkeleton width="50px" height="20px" bg="rgba(255,255,255,0.2)" style="margin-right:5px"/>
            <XtxSkeleton width="100px" height="20px" bg="rgba(255,255,255,0.2)" style="margin-right:5px"/>
         </li>
      </ul>
    </template>
    <!-- 弹层 -->
    <div class="layer" v-if="curCate">
    <h4>分类推荐 <small>根据您的购买或浏览记录推荐</small></h4>
     <template v-if="curCate && curCate.id==='brand'">
    <!-- 品牌 -->
       <ul>
        <li class="brand" v-for="brand in curCate.goods" :key="brand.id">
          <RouterLink to="/">
            <img :src="brand.picture" alt="">
            <div class="info">
              <p class="name ellipsis-2">{{brand.name}}</p>
              <p class="desc ellipsis">{{brand.place}}</p>
              <p class="price"><i>¥</i>{{brand.desc}}</p>
            </div>
          </RouterLink>
        </li>
       </ul>
     </template>
     <template v-else>
     <!-- 分类 -->
       <ul v-if="curCate">
         <li v-for="goods in curCate.goods" :key="goods.id">
           <RouterLink :to="'/goods/' + goods.id">
             <img :src="goods.picture" alt="">
             <div class="info">
               <p class="name ellipsis-2">{{goods.name}}</p>
               <p class="desc ellipsis">{{goods.desc}}</p>
               <p class="price"><i>¥</i>{{goods.price}}</p>
             </div>
           </RouterLink>
         </li>
       </ul>
     </template>
    </div>
  </div>
</template>

<script>
import { useStore } from 'vuex'
import { reactive, computed, ref } from 'vue'
import { findBrand } from '@/api/home.js'
import xtxSkeleton from '@/components/xtx-skeleton.vue'
export default {
  components: { xtxSkeleton },
  name: 'HomeCategory',
  setup () {
    const brand = reactive({
      id: 'brand',
      name: '品牌',
      goods: [],
      children: [{ id: 'brand-children', name: '品牌推荐' }]
    })
    const store = useStore()
    const cateList = computed(() => {
      const list = store.state.category.list.map(item => {
        return {
          id: item.id,
          name: item.name,
          // 防止初始化没有children的时候调用slice函数报错
          children: item.children && item.children.slice(0, 2),
          goods: item.goods
        }
      })
      list.push(brand)
      return list
    })
    const curCateId = ref(null)
    //  curCateId变化，会使计算属性重新计算
    const curCate = computed(() => {
      const cate = cateList.value.find(item => item.id === curCateId.value)
      return cate
    })
    findBrand().then(data => {
      console.log('findBrand', data)
      brand.goods = data.result
    })
    return { cateList, curCateId, curCate }
  }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0,0,0,0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover,&.active {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  .layer {
        li.brand {
  height: 180px;
  a {
    align-items: flex-start;
    img {
      width: 120px;
      height: 160px;
    }
    .info {
      p {
        margin-top: 8px;
      }
      .place {
        color: #999;
      }
    }
  }
}
    width: 990px;
    height: 500px;
    background: rgba(255,255,255,0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
              width: 95px;
              height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
}
</style>
